|Pos|No|Rider|Bike|Laps|Time|Grid|Points|
|---|---|---|---|---|---|---|---|
|1|21|Troy Bayliss|Ducati 999 F07|22|34:11.276|1|25|
|2|52|James Toseland|Honda CBR1000RR|22|+2.096|2|20|
|3|3|Max Biaggi|Suzuki GSX-R1000 K7|22|+10.143|5|16|
|4|41|Noriyuki Haga|Yamaha YZF-R1|22|+18.923|4|13|
|5|11|Troy Corser|Yamaha YZF-R1|22|+19.742|3|11|
|6|57|Lorenzo Lanzi|Ducati 999 F07|22|+24.765|10|10|
|7|111|Ruben Xaus|Ducati 999 F06|22|+27.404|8|9|
|8|76|Max Neukirchner|Suzuki GSX-R1000 K6|22|+34.614|7|8|
|9|10|Fonsi Nieto|Kawasaki ZX-10R|22|+35.339|6|7|
|10|99|Steve Martin|Honda CBR1000RR|22|+36.238|11|6|
|11|44|Roberto Rolfo|Honda CBR1000RR|22|+38.067|15|5|
|12|25|Josh Brookes|Honda CBR1000RR|22|+47.078|12|4|
|13|38|Shinichi Nakatomi|Yamaha YZF-R1|22|+58.571|17|3|
|14|96|Jakub Smrž|Ducati 999 F05|22|+1:08.000|14|2|
|15|53|Alex Polita|Suzuki GSX-R1000 K6|22|+1:22.584|18|1|
|16|73|Christian Zaiser|MV Agusta F4 1000R|22|+1:28.374|19||
|17|42|Dean Ellison|Ducati 999RS|22|+1:30.184|21||
|18|36|Jiri Drazdak|Yamaha YZF-R1|21|+1 Lap|20||
|Ret|55|Régis Laconi|Kawasaki ZX-10R|16|Retirement|9||
|Ret|84|Michel Fabrizio|Honda CBR1000RR|5|Retirement|13||

Question: what is the number of non-retired riders?
Answer: 18